Is there a specific issue you have using this export? I'm the more or less active maintainer of that export component (read: I keep it running for my day job, which means it is currently tested for Oxygen, not yet for Photon) so if you have a specific issue I'll try to help.

Quick edit: I did get the war product tool working on Oxygen with the 3.6.0 relase, so that's at least got me going.

I did try looking into maven / tycho to do the build (and the consensus seems to be that this is the best way yto go), but I'm feeling like a bit of an idiot there since I couldn't get things to work at all when I tried modifying the build infrastructure shown in the git repository. There's a lot going on there, so it's difficult to see the forest throught the trees : >. If anyone has a simple example which works with a simple local bundle (e..g. how would the rap.e4.demo bundle get built / deployed as a war file), that would be really useful. Most of the other examples that I've found in my searches seem to be > 8 years old.

It is true that Libra is lacking resources for active development, however I still plan to keep it running.

There has a new build instance been set up at Eclipse, and I'll be looking into upgrading the code to 2018.09 in the next few weeks.
I've just managed to sucessfully complete a Photon compatible build at Jenkins - you can download the ZIP and use it as an update site to install the WAR Export.

I just wanted to send a big big "Thank you!!!" into your direction for fixing up a compatible Libra build for Eclipse 4.8/4.9!! I'm using the latest SNAPSHOT build in 2018.09 and it's working like a charm! It's very much appreciated indeed!

When the WAR tooling broke a few Eclipse releases ago, this was actually quite a pain point for me. I had to switch to a previous Eclipse version just for being able to build the WAR file. I starting looking into the Libra tooling sources and also considered trying out a maven-based build using Tycho, but I didn't really came to a usuale result. Having this fixed version now provided by you helps a lot!

Now I can move over to the next big issue of investigating running my Eclipse RAP app on Java >8 ;)